Cook lasagna noodles according to package directions. Meanwhile, in a large skillet, cook beef over medium heat until no longer pink; drain. Stir in spaghetti sauce and, if desired, fennel seed; heat through.
Drain noodles. Spread 1/4 cup meat sauce over each noodle; sprinkle with 2 tablespoons cheese. Carefully roll up noodles and place seam side down in an 8-in. square baking dish. Top with remaining sauce and cheese.
Bake, uncovered, at 400° for 10-15 minutes or until heated through and cheese is melted.